FD log from /proc for struck zmtrigger proccess always included one deleted zm.mmap file like
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lr-x------ 1 apache apache 64 Nov 9 15:20 0 -> /usr/bin/zmtrigger.pl
l-wx------ 1 apache apache 64 Nov 9 15:20 1 -> /var/log/zoneminder/zmdc.log
lr-x------ 1 apache apache 64 Nov 9 15:20 2 -> pipe:[586693474]
l-wx------ 1 apache apache 64 Nov 9 15:20 3 -> /var/log/zoneminder/zmtrigger.log
lrwx------ 1 apache apache 64 Nov 9 15:20 4 -> socket:[628872535]
lrwx------ 1 apache apache 64 Nov 9 15:20 5 -> socket:[628872532]
lrwx------ 1 apache apache 64 Nov 9 15:20 6 -> socket:[628872536]
lrwx------ 1 apache apache 64 Nov 9 15:20 7 -> socket:[733707992]
lrwx------ 1 apache apache 64 Nov 9 15:20 8 -> /dev/shm/zm.mmap.118 (deleted)